Wagner Tuning BMW E-series N55 EVO 3 Competition De-cat Package

Wagner Tuning BMW E-Series N55 EVO3 Competition De-Cat Package

This Competition package from Wagner Tuning bundles two of the most effective performance upgrades for the BMW N55 engine into one kit – an EVO3 front-mount intercooler and a high-flow de-cat downpipe. Together, they tackle the two biggest restrictions on power in the N55: heat soak in the charge air system and back pressure in the exhaust.

Whether you’re running a BMW 135i or 335i on the E-series chassis, this package is designed to support serious performance tuning by improving both the intake charge cooling and exhaust gas flow. Use the vehicle lookup tool on this page, or check the Vehicle Fitment tab to confirm compatibility with your specific model.

EVO3 Competition Intercooler Upgrade Kit (Part No. 200001113)

The Wagner Tuning EVO3 intercooler is a substantial upgrade over the factory unit. The standard intercooler on the N55 copes with stock power levels, but once you start pushing the engine harder – through tuning or sustained spirited driving – it struggles to keep charge air temperatures under control. Hot air entering the engine is less dense and carries less oxygen, which reduces power and can cause the ECU to pull back ignition timing to protect the engine.

The EVO3 addresses this directly. It measures 510mm x 303mm x 180mm and offers a 162% larger flow area and 182% more charge air volume compared to the stock intercooler. In practical terms, the air feeding the engine stays cooler for longer, even under hard driving conditions.

Core and Construction

The core uses a tube-fin mesh design with internal turbulators – small internal features that disrupt airflow inside the cooler to increase contact between the hot air and the cooler surfaces, improving heat transfer. The end tanks (the chambers at each end of the core) are cast aluminium and have been shaped using CFD (Computational Fluid Dynamics) analysis, a computer-based method for modelling how gases flow through a component. This helps minimise pressure drop across the core, so you gain cooling without losing airflow.

Inlet and outlet diameters have been increased to 70mm to support the higher airflow demands of a tuned N55. Despite its size, the intercooler weighs just 13.2kg. An anti-corrosion coating with heat-conductive properties is applied to ensure longevity and consistent performance, and the unit is tested and rated pressure-stable up to 6 bar.

High-Flow De-Cat Downpipe

The factory catalytic converter is one of the largest exhaust restrictions on the N55. Replacing it with Wagner’s de-cat downpipe allows exhaust gases to leave the turbo more freely, which reduces back pressure, helps the turbo spool more quickly and supports higher power output when paired with a remap.

The downpipe is constructed from stainless steel with smooth mandrel bends to maintain flow, and is designed to bolt directly to the factory exhaust system without modification.

Important: A de-cat downpipe removes the catalytic converter and is intended for off-road or motorsport use only. It will trigger an engine management light unless paired with appropriate ECU software, and is not road legal in many regions. Please check local regulations before fitting.

What’s Included

• 1 x EVO3 intercooler core
• 2 x reinforced silicone hoses
• 1 x aluminium adapter
• 1 x stainless steel de-cat downpipe
• Mounting hardware and gaskets
• Assembly instructions

Why Choose This Package?

Buying the intercooler and downpipe together as a package is the most cost-effective way to unlock meaningful gains from the N55 engine. The intercooler keeps intake temperatures stable so the engine can make consistent power, while the de-cat downpipe reduces exhaust restriction to help the turbo work more efficiently. Combined with a supporting ECU remap, this is a proven foundation for stage 2 tuning on the N55